Trello is not just a to-do manager. With this app, you can organize any project into cards, which can be used as a private tracker of your progress, or shared with friends and colleagues that you're working with. To top it off, it all comes in an attractive package with cloud syncing.
Everything in Trello is grouped into boards, which should be treated as separate projects. The cards are individual aspects of each project board. You might want to add cards with photos, notes on who is working on various items, or checklists of individual to-dos. You can imagine Trello as a sort of virtual whiteboard for keeping track of your ideas. All this is synced to the Trello website for easier access when you're at a computer. The first release should run fine on phones and tablets up to 7-inches, but there is currently no 10-inch optimized UI.
This app, and the associated website, come courtesy of Fog Creek Software. Joel Spolsky is the man behind this venture, and you might be familiar with some of his previous work - just a little site called StackOverflow. The app has an impressive pedigree, but it also feels like a solid port to Android. This is not just a warmed over iOS clone; the app uses the Android column layout, as well as the action bar. Trello is free, so check it out.